#666FC9#666FC9

#666FC9 is a mid, vivid blue. Relative luminance 0.184; OKLCH L 57.7% C 0.137 H 276.9°. Best body text is #000000 at 4.68:1 contrast (WCAG AA passes).

Color values

HEX	#666FC9
RGB	rgb(102, 111, 201)
HSL	hsl(235, 48%, 59%)
HSV	hsv(235, 49%, 79%)
CMYK	cmyk(49.3%, 44.8%, 0%, 21.2%)
CIE-LAB	lab(49.99, 21.17, -48.03)
CIE-LCH	lch(49.99, 52.49, 293.79°)
OKLab	oklab(57.69% 0.0165 -0.1363)
OKLCH	oklch(57.69% 0.137 276.9)
XYZ	xyz(21.7033, 18.4095, 57.6568)
Luminance	0.1841 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#666FC9 #C9C066

analogous

#66A1C9 #666FC9 #8E66C9

triadic

#666FC9 #C9666F #6FC966

tetradic

#666FC9 #C966A1 #C9C066 #66C98E

square

#666FC9 #C966A1 #C9C066 #66C98E

split-complementary

#666FC9 #C98E66 #A1C966

monochromatic

#2F3785 #3F4AB3 #666FC9 #939AD9 #C0C4E9

Accessibility & contrast

On white

4.49

#666FC9 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

4.68

#666FC9 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #666FC9

4.68:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##666FC9	#FFFFFF	#000000	##000000
##666FC9	1.00	4.49	4.68	4.68
#FFFFFF	4.49	1.00	21.00	21.00
#000000	4.68	21.00	1.00	1.00
##000000	4.68	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#4A7BCC

Deuteranopia (green-blind)

#4173C7

Tritanopia (blue-blind)

#3F8292

Achromatopsia (no color)

#777777

Design tokens & code

CSS

--color: #666fc9;
/* rgb */ color: rgb(102, 111, 201);
/* oklch */ color: oklch(57.7% 0.137 276.9);

Tailwind

colors: {
  custom: {
    50: '#9798da',
    500: '#666fc9',
    950: '#000000',
  },
}

SCSS

$custom: #666fc9;
$custom-light: #9798da;
$custom-dark: #000000;

JSON

{
  "hex": "#666fc9",
  "rgb": {
    "r": 102,
    "g": 111,
    "b": 201
  },
  "hsl": {
    "h": 234.545,
    "s": 47.826,
    "l": 59.412
  },
  "oklch": {
    "l": 0.57695,
    "c": 0.13732,
    "h": 276.9
  },
  "luminance": 0.18411
}

Semantic roles & 50–950 ramp

primary

#666FC9

secondary

#D9D5B2

accent

#CB50D7

background

#F9F9FD

surface

#F2F2FB

border

#CCCCD4

text

#0E0D15

muted

#7E7E83

Preview Lab

Preview with #666FC9

Body copy rendered with the generated semantic roles for this colour.

Preview Lab → · Contrast checker → · Palette generator →